What Is the Presumption of Undue Influence in California?

Under California law, the presumption of undue influence in California is a rule that automatically treats certain gifts in a will, trust, or similar document as the product of fraud or undue influence when the person receiving the gift stands in a suspect relationship to the person who signed. The rule lives in Probate Code Section 21380. Once it applies, the beneficiary carries the burden of proving the transfer was legitimate, and in some situations the gift is voided outright with no chance to defend it.

Who Falls Under the Presumption

Section 21380 lists seven categories of people. If any of them receives a gift through a donative instrument, the law presumes the gift resulted from fraud or undue influence, without any showing of actual pressure or manipulation. The categories are:

The person who drafted the instrument.
A fiduciary of the person signing who transcribed the instrument or caused it to be transcribed.
A care custodian of a dependent adult, but only if the document was signed while services were being provided or within 90 days before or after that period.
A care custodian who began a marriage, cohabitation, or domestic partnership with a dependent adult during or within 90 days after providing services, if the gift was made less than six months into the relationship.
Anyone related by blood or marriage within three degrees to the drafter, fiduciary transcriber, or care custodian.
A cohabitant or employee of the drafter, fiduciary transcriber, or care custodian.
A partner, shareholder, or employee of a law firm in which the drafter or fiduciary transcriber has an ownership interest.

The trigger is the relationship plus the gift. Nothing else. Once triggered, the burden shifts to the beneficiary.¹

When the Presumption Cannot Be Rebutted

Not every beneficiary gets a chance to fight back. Under Section 21380(c), if the person who drafted the instrument receives a gift through that same instrument, the presumption is conclusive. The transfer is invalid, and no evidence about the signer’s true wishes will save it. The same irrebuttable rule applies to the drafter’s relatives within three degrees, cohabitants, employees, and law firm associates.¹

So an attorney who drafts a client’s will and names herself, her spouse, or her law partner as a beneficiary loses that gift automatically. The rule exists because the drafter’s control over the document creates a conflict that testimony cannot cure.

Exceptions That Take a Gift Outside the Rule

Section 21382 lists situations where the presumption does not apply at all, even when the beneficiary looks like one of the people described in Section 21380. The most practically important exceptions:

Gifts to someone related by blood or marriage within four degrees of the signer, or to a cohabitant. This exception covers most family estate plans. It does not protect a care custodian who entered a personal relationship with a dependent adult under the circumstances in 21380(a)(4).
Instruments drafted or transcribed by a family member or cohabitant within four degrees of the signer.
Documents approved by the court after full disclosure of the relationships involved.
Gifts to public entities or to tax-exempt charities under IRC 501(c)(3) or 501(c)(19).
Gifts of $5,000 or less, provided the estate meets the threshold in Probate Code Section 13100.
Instruments executed outside California by someone who was not a California resident at the time of execution.

The family exception carries the most weight in everyday practice. A daughter who helps her father put together a will leaving her the family home does not face the presumption, because the relationship sits well within four degrees.²

Using a Certificate of Independent Review

When a gift would trigger the presumption and no exception in 21382 applies, there is still a way to protect it before the document is signed. Probate Code 21384 allows an independent attorney to counsel the person making the gift, outside the presence of any heir or proposed beneficiary, about the nature and consequences of the transfer, including its effect on other heirs and any prior estate plan. The attorney must also try to determine whether the transfer results from fraud or undue influence.³

If the reviewing attorney concludes the transfer is legitimate, she signs a certificate saying so, and the presumption drops away. There is one limit worth knowing: an attorney who drafted the instrument can only certify transfers to care custodians. In every other situation, the reviewing attorney must be someone other than the drafter. For anyone planning a gift to a caregiver, financial advisor, or other person covered by 21380, obtaining this certificate at signing is the single most effective way to insulate the gift from a later challenge.

How a Beneficiary Rebuts the Presumption

Where the presumption is rebuttable, the beneficiary must prove by clear and convincing evidence that the transfer was not the product of fraud or undue influence. That is a higher bar than the “more likely than not” standard used in ordinary civil cases.¹

Evidence that tends to carry weight:

Testimony from disinterested witnesses who observed the signer and can speak to their state of mind and intentions.
Evidence that the signer expressed the same wishes well before the challenged document was drawn up. A pattern of prior gifts to the same beneficiary, or repeated statements to friends and family about intended distributions, makes coercion harder to argue.
Medical records showing the signer was mentally sharp around the time of execution. Cognitive assessments, physician notes, and neuropsychological evaluations all help.
Evidence that the signer received advice from a lawyer unconnected to the beneficiary, even if a formal Certificate of Independent Review was never issued.

The strongest rebuttal cases combine several of these threads. A single piece of evidence rarely carries the day, especially where the beneficiary and the signer were in a relationship of dependency or trust.

Deadlines for Bringing a Challenge

Timing matters, and missing it can end a claim before anyone looks at the evidence. For wills, an interested party generally has 120 days after a will is admitted to probate to file a contest. Trusts work differently because they usually do not go through the same formal admission process. An heir or beneficiary can file a petition under Probate Code 17200 asking the court to determine the validity of a trust provision, including whether it resulted from undue influence.⁴

For trusts, the clock often starts when the trustee sends a notification under Probate Code 16061.7 telling beneficiaries and heirs that the trust has become irrevocable, typically because the person who created it has died. Treat that notice as a deadline, not a courtesy.

A Separate Presumption for Trustee Transactions

Section 21380 is not the only presumption in this area, and the two are easy to confuse. Probate Code 16004 creates a distinct presumption for transactions between a trustee and a beneficiary. If a trustee obtains an advantage from a beneficiary while serving as trustee, or while the trustee’s influence persists, the law presumes the transaction violated the trustee’s fiduciary duties. That presumption reaches any transaction where the trustee gains an advantage, not only donative transfers in estate planning documents.⁵

It matters when, for example, a trustee buys trust property from a beneficiary below market, or persuades a beneficiary to modify the trust in the trustee’s favor. If your concern is a trustee’s conduct rather than the terms of a will or trust at signing, this is the rule to look at.

1
California Legislative Information. California Probate Code 21380 – Presumption of Fraud or Undue Influence
2
California Legislative Information. California Probate Code 21382
3
California Legislative Information. California Probate Code 21384
4
California Legislative Information. California Probate Code 17200
5
California Legislative Information. California Probate Code 16004 – Trust Law